Check out CNN affiliate KATU-TV in Portland, Oregon, for more information on the case.
(CNN) -- Authorities in Portland, Oregon, are expected to release more details Wednesday in their investigation into the disappearance of 7-year-old Kyron Horman, according to the Multnomah County Sheriff's Office.
A news conference will be held at 11 a.m. (2 p.m. ET) "to release certain case details in an effort to obtain the public's help in gathering further information in this investigation," the sheriff's office said.
Kyron was last seen June 4 when his stepmother, Terri Horman, told detectives she saw him walking down the hall of Skyline Elementary School toward his second-grade classroom.
Authorities conducted more searches over the weekend as part of their investigation into his disappearance, which officials have said involved criminal behavior.
The sheriff's office said the searches were prompted by information related to the case but would not disclose specifics of the operation except to say the areas canvassed were near the school.
No suspect has been named in the case, but intense scrutiny has been placed on Terri Horman and her associates.
A spokeswoman for the sheriff's office declined to comment on published reports that said the weekend's searches were initiated following a tip from DeDe Spicher, a friend of Horman's.
Spicher stayed with Terri Horman after her husband, Kaine Horman, filed for divorce shortly after his son's disappearance and moved out of the family home.
Spicher was subpoenaed last month to meet with a grand jury investigating Kyron's disappearance. Other associates of Terri Horman's also are believed to have testified before the grand jury.
In divorce filings, Kaine Horman has said he believes that Terri Horman "is involved in the disappearance of my son Kyron."
Court documents also allege Terri Horman attempted to hire a man to kill her husband.
CNN affiliate KATU-TV in Portland reported Tuesday that a new flier was distributed by law enforcement seeking the public's help in the investigation.
The two-page flier asks residents near the Skyline school whether they saw Terri Horman and Spicher in the area on the day Kyron disappeared, and includes photos of both women as well as the white pickup Terri Horman was driving that day.
The Oregonian newspaper reported last month that detectives have asked Spicher about her whereabouts the day Kyron was last seen.
According to the newspaper, Spicher was doing gardening work for a Portland homeowner when she "abruptly left about 11:30 a.m."
The homeowner tried reaching Spicher on her cell phone, the newspaper reported, but got no answer. Spicher returned to the house about 90 minutes later, the newspaper reported, citing detectives.
The flier distributed Tuesday specifically asks residents whether they saw the two women between 9:45 a.m. and 1 p.m.
A $50,000 reward has been offered for any information leading to Kyron.
CNN's Gabriel Falcon contributed to this report.